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Thread: RD250LC fork oil

  1. #1
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    20th November 2002 - 11:00
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    RD250LC fork oil

    I've decided to change the fork oil on the old RD and had a lookie in the service manual:

    253cm3 of SAE 10W30 SE motor oil. WTF!?

    So; knowing some of you race the critters - what do you use and how much?

    These forks are standard AFAIK. No emulators, no air valve etc.

  2. #2
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    24th June 2004 - 17:27
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    Be careful - any deviation from std will validate the warrenty...

    Back in the day - we didn't have fork oil - we used atf or engine oil...

  3. #3
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    Pretty simple I would have thought. Doesn't the viscosity rating measure the viscosity at cold and hot temperatures?

    Therefore you look at the cold temperature. And 10 weight fork oil should do you fine.

    Now - is that 253cc PER fork, or total?
    And I to my motorcycle parked like the soul of the junkyard. Restored, a bicycle fleshed with power, and tore off. Up Highway 106 continually drunk on the wind in my mouth. Wringing the handlebar for speed, wild to be wreckage forever.

    - James Dickey, Cherrylog Road.

  4. #4
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    Quote Originally Posted by riffer View Post
    Pretty simple I would have thought. Doesn't the viscosity rating measure the viscosity at cold and hot temperatures?

    Therefore you look at the cold temperature. And 10 weight fork oil should do you fine.

    Now - is that 253cc PER fork, or total?
    Per fork. Shows how new to biking I am huh? Never seen motor oil specified before.

    It didn't have engine oil in there - it was fork oil. I was going to use 20 weight as the front end is rather bouncy (and 'plush').

  5. #5
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    Quote Originally Posted by Paul in NZ View Post
    Be careful - any deviation from std will validate the warrenty...

    Back in the day - we didn't have fork oil - we used atf or engine oil...
    Bugger; didn't think of the warrenty... Shouldn't of changed the tyres I guess.

  6. #6
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    Quote Originally Posted by Skunk View Post
    It didn't have engine oil in there - it was fork oil. I was going to use 20 weight as the front end is rather bouncy (and 'plush').
    And you don't care how many fork seals you blow...

    Wouldn't you be better trying heavier springs and using the original weight fork oil? You're less likely to push the components past their performance limits that way...
    And I to my motorcycle parked like the soul of the junkyard. Restored, a bicycle fleshed with power, and tore off. Up Highway 106 continually drunk on the wind in my mouth. Wringing the handlebar for speed, wild to be wreckage forever.

    - James Dickey, Cherrylog Road.

  7. #7
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    Quote Originally Posted by riffer View Post
    And you don't care how many fork seals you blow...

    Wouldn't you be better trying heavier springs and using the original weight fork oil? You're less likely to push the components past their performance limits that way...
    Heavier springs are out of the budget at this stage so I'll be getting some fork oil and seeing how std settings go. I think it'll be a little soft though.

    I was hoping for some input from the guys who race them in pre 82 so as to save me pissing about trying to get them right by trial and error.

  8. #8
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    Quote Originally Posted by Skunk View Post
    I was hoping for some input from the guys who race them in pre 82 so as to save me pissing about trying to get them right by trial and error.
    All those who race them down here pretty much say the front ends are crap no matter what oil you put in them and they're also undersprung

    PM Dangerous and/or Bren_chch they've both had there's modified and might tell you what was done
    "If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough power."


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  9. #9
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    Quote Originally Posted by Skunk View Post
    Heavier springs are out of the budget at this stage so I'll be getting some fork oil and seeing how std settings go. I think it'll be a little soft though.

    I was hoping for some input from the guys who race them in pre 82 so as to save me pissing about trying to get them right by trial and error.
    Irrespective of cost emulators ( even without doing springs ) is the very first thing you should do. Very poor hydraulic control is 70% or so of the problem with forks such as these.

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